| http://www.w3.org/ns/prov#value | - German Laid-Open Application DOS No. 2,723,905, for instance, discloses obtaining these compounds by subjecting first styrene and then a styrene/isoprene mixture to polymerization and then a reacting the block polymer first with an alkylene oxide, for example ethylene oxide, and subsequently subjecting the reaction product to a further reaction with a cyclic dicarboxylic anhydride of an unsaturate
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